<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>社交平台 - 二级栏目展示</title>
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/css/bootstrap.min.css" rel="stylesheet">
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css">
    <style>
        :root {
            --primary: #165DFF;
            --primary-light: #E8F3FF;
            --primary-dark: #0E42D2;
            --secondary: #36CFC9;
            --success: #52C41A;
            --warning: #FAAD14;
            --danger: #FF4D4F;
            --dark: #1D2129;
            --gray: #86909C;
            --light: #F2F3F5;
            --border: #E5E6EB;
            --shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
            --shadow-hover: 0 6px 16px rgba(0, 0, 0, 0.1);
        }
        
        body {
            font-family: 'Inter', system-ui, -apple-system, sans-serif;
            background-color: #F7F8FA;
            color: var(--dark);
            line-height: 1.6;
        }
        
        .container {
            max-width: 1200px;
        }
        
        /* 导航栏样式 */
        .navbar {
            background-color: white;
            box-shadow: var(--shadow);
            padding: 0.75rem 1rem;
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        
        .navbar-brand {
            font-weight: 700;
            color: var(--primary);
            font-size: 1.5rem;
        }
        
        .nav-link {
            color: var(--dark);
            margin-left: 1rem;
            font-weight: 500;
            transition: color 0.2s;
        }
        
        .nav-link:hover, .nav-link.active {
            color: var(--primary);
        }
        
        /* 主内容区 */
        .main-content {
            padding: 2rem 0;
        }
        
        /* 页面标题 */
        .page-header {
            margin-bottom: 2.5rem;
            padding-bottom: 1rem;
            border-bottom: 1px solid var(--border);
        }
        
        .page-title {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 0.5rem;
            color: var(--dark);
        }
        
        .page-desc {
            color: var(--gray);
            max-width: 800px;
        }
        
        /* 栏目通用样式 */
        .section {
            margin-bottom: 3.5rem;
        }
        
        .section-header {
            margin-bottom: 1.5rem;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 1rem;
        }
        
        .section-title {
            font-size: 1.5rem;
            font-weight: 600;
            margin-bottom: 0;
            display: flex;
            align-items: center;
        }
        
        .section-title i {
            color: var(--primary);
            margin-right: 0.75rem;
            width: 28px;
            height: 28px;
            display: flex;
            align-items: center;
            justify-content: center;
            background-color: var(--primary-light);
            border-radius: 6px;
        }
        
        .section-actions {
            display: flex;
            gap: 0.75rem;
        }
        
        .view-all {
            color: var(--primary);
            text-decoration: none;
            font-weight: 500;
            display: flex;
            align-items: center;
            padding: 0.375rem 0.75rem;
            border-radius: 6px;
            transition: background-color 0.2s;
        }
        
        .view-all:hover {
            color: var(--primary-dark);
            background-color: var(--primary-light);
        }
        
        .view-all i {
            margin-left: 0.25rem;
            font-size: 0.85rem;
        }
        
        /* 1. 分类卡片栏目 */
        .category-cards {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 1.5rem;
        }
        
        .category-card {
            background-color: white;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: transform 0.3s, box-shadow 0.3s;
            height: 100%;
            display: flex;
            flex-direction: column;
        }
        
        .category-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-hover);
        }
        
        .category-img {
            width: 100%;
            height: 160px;
            object-fit: cover;
        }
        
        .category-body {
            padding: 1.25rem;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        
        .category-title {
            font-weight: 600;
            font-size: 1.1rem;
            margin-bottom: 0.5rem;
        }
        
        .category-desc {
            font-size: 0.9rem;
            color: var(--gray);
            margin-bottom: 1rem;
            flex: 1;
        }
        
        .category-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 0.85rem;
            color: var(--gray);
        }
        
        .category-count {
            display: flex;
            align-items: center;
        }
        
        .category-count i {
            margin-right: 0.25rem;
        }
        
        /* 2. 话题标签栏目 */
        .topics-section {
            background-color: white;
            border-radius: 12px;
            padding: 1.5rem;
            box-shadow: var(--shadow);
        }
        
        .topics-tabs {
            display: flex;
            gap: 0.5rem;
            margin-bottom: 1.5rem;
            overflow-x: auto;
            padding-bottom: 0.5rem;
            scrollbar-width: thin;
        }
        
        .topics-tabs::-webkit-scrollbar {
            height: 4px;
        }
        
        .topics-tabs::-webkit-scrollbar-thumb {
            background-color: var(--border);
            border-radius: 2px;
        }
        
        .topic-tab {
            padding: 0.5rem 1.25rem;
            background-color: var(--light);
            border-radius: 20px;
            font-size: 0.9rem;
            white-space: nowrap;
            cursor: pointer;
            transition: all 0.2s;
        }
        
        .topic-tab.active {
            background-color: var(--primary);
            color: white;
        }
        
        .topic-tab:hover:not(.active) {
            background-color: var(--border);
        }
        
        .topics-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
            gap: 1rem;
        }
        
        .topic-item {
            padding: 1rem;
            border: 1px solid var(--border);
            border-radius: 8px;
            transition: all 0.2s;
        }
        
        .topic-item:hover {
            border-color: var(--primary-light);
            background-color: var(--primary-light);
            transform: translateY(-2px);
        }
        
        .topic-name {
            font-weight: 600;
            margin-bottom: 0.25rem;
            display: flex;
            align-items: center;
        }
        
        .topic-name i {
            color: var(--primary);
            margin-right: 0.5rem;
            font-size: 0.9rem;
        }
        
        .topic-posts {
            font-size: 0.85rem;
            color: var(--gray);
        }
        
        /* 3. 活动日历栏目 */
        .events-calendar {
            background-color: white;
            border-radius: 12px;
            padding: 1.5rem;
            box-shadow: var(--shadow);
        }
        
        .calendar-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 1.5rem;
        }
        
        .calendar-month {
            font-weight: 600;
            font-size: 1.1rem;
        }
        
        .calendar-nav {
            display: flex;
            gap: 0.5rem;
        }
        
        .calendar-nav-btn {
            width: 32px;
            height: 32px;
            border-radius: 50%;
            border: 1px solid var(--border);
            background-color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: all 0.2s;
        }
        
        .calendar-nav-btn:hover {
            background-color: var(--primary-light);
            border-color: var(--primary-light);
            color: var(--primary);
        }
        
        .calendar-grid {
            display: grid;
            grid-template-columns: repeat(7, 1fr);
            gap: 0.5rem;
        }
        
        .calendar-day-name {
            text-align: center;
            font-size: 0.85rem;
            color: var(--gray);
            padding: 0.5rem 0;
            font-weight: 500;
        }
        
        .calendar-date {
            aspect-ratio: 1;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 8px;
            font-size: 0.9rem;
            position: relative;
            cursor: pointer;
            transition: all 0.2s;
        }
        
        .calendar-date:hover {
            background-color: var(--light);
        }
        
        .calendar-date.today {
            background-color: var(--primary-light);
            color: var(--primary);
            font-weight: 600;
        }
        
        .calendar-date.has-event::after {
            content: '';
            position: absolute;
            bottom: 4px;
            width: 4px;
            height: 4px;
            border-radius: 50%;
            background-color: var(--primary);
        }
        
        .upcoming-events {
            margin-top: 1.5rem;
        }
        
        .event-item {
            display: flex;
            align-items: center;
            padding: 0.75rem 0;
            border-bottom: 1px solid var(--border);
        }
        
        .event-item:last-child {
            border-bottom: none;
        }
        
        .event-date {
            width: 48px;
            height: 48px;
            background-color: var(--primary-light);
            color: var(--primary);
            border-radius: 8px;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            margin-right: 1rem;
            flex-shrink: 0;
        }
        
        .event-date-day {
            font-weight: 700;
            font-size: 1.1rem;
            line-height: 1;
        }
        
        .event-date-month {
            font-size: 0.75rem;
            text-transform: uppercase;
        }
        
        .event-details {
            flex: 1;
        }
        
        .event-title {
            font-weight: 500;
            margin-bottom: 0.25rem;
        }
        
        .event-time {
            font-size: 0.85rem;
            color: var(--gray);
            display: flex;
            align-items: center;
        }
        
        .event-time i {
            margin-right: 0.25rem;
            font-size: 0.75rem;
        }
        
        .event-join {
            color: var(--primary);
            font-size: 0.9rem;
            font-weight: 500;
            cursor: pointer;
            white-space: nowrap;
        }
        
        /* 4. 热门创作者栏目 */
        .creators-list {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            gap: 1.5rem;
        }
        
        .creator-card {
            background-color: white;
            border-radius: 12px;
            padding: 1.5rem;
            text-align: center;
            box-shadow: var(--shadow);
            transition: transform 0.3s, box-shadow 0.3s;
        }
        
        .creator-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-hover);
        }
        
        .creator-avatar {
            width: 90px;
            height: 90px;
            border-radius: 50%;
            margin: 0 auto 1rem;
            object-fit: cover;
            border: 3px solid var(--primary-light);
        }
        
        .creator-placeholder {
            width: 90px;
            height: 90px;
            border-radius: 50%;
            margin: 0 auto 1rem;
            background-color: var(--primary-light);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 2rem;
            font-weight: 600;
            border: 3px solid var(--primary-light);
        }
        
        .creator-name {
            font-weight: 600;
            font-size: 1.1rem;
            margin-bottom: 0.25rem;
        }
        
        .creator-category {
            font-size: 0.85rem;
            color: var(--gray);
            margin-bottom: 0.75rem;
            display: inline-block;
            background-color: var(--light);
            padding: 0.25rem 0.75rem;
            border-radius: 12px;
        }
        
        .creator-stats {
            display: flex;
            justify-content: center;
            gap: 1rem;
            font-size: 0.85rem;
            margin-bottom: 1rem;
        }
        
        .creator-stat {
            text-align: center;
        }
        
        .creator-stat-value {
            font-weight: 600;
            color: var(--dark);
        }
        
        .creator-stat-label {
            color: var(--gray);
            font-size: 0.75rem;
        }
        
        .creator-follow {
            display: inline-block;
            padding: 0.45rem 1.25rem;
            background-color: var(--primary);
            color: white;
            border: none;
            border-radius: 6px;
            font-weight: 500;
            font-size: 0.9rem;
            transition: background-color 0.2s;
            width: 100%;
        }
        
        .creator-follow:hover {
            background-color: var(--primary-dark);
            color: white;
        }
        
        .creator-follow.following {
            background-color: var(--light);
            color: var(--dark);
        }
        
        /* 5. 兴趣小组栏目 */
        .groups-section {
            background-color: white;
            border-radius: 12px;
            padding: 1.5rem;
            box-shadow: var(--shadow);
        }
        
        .groups-filters {
            display: flex;
            gap: 1rem;
            margin-bottom: 1.5rem;
            flex-wrap: wrap;
        }
        
        .group-filter {
            padding: 0.5rem 1.25rem;
            border: 1px solid var(--border);
            border-radius: 6px;
            font-size: 0.9rem;
            cursor: pointer;
            transition: all 0.2s;
            background-color: white;
        }
        
        .group-filter.active {
            border-color: var(--primary);
            background-color: var(--primary-light);
            color: var(--primary);
            font-weight: 500;
        }
        
        .groups-list {
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }
        
        .group-item {
            display: flex;
            align-items: center;
            padding: 1rem;
            border-radius: 8px;
            border: 1px solid var(--border);
            transition: all 0.2s;
        }
        
        .group-item:hover {
            border-color: var(--primary-light);
            background-color: var(--primary-light);
        }
        
        .group-logo {
            width: 64px;
            height: 64px;
            border-radius: 8px;
            object-fit: cover;
            margin-right: 1.25rem;
            flex-shrink: 0;
        }
        
        .group-info {
            flex: 1;
        }
        
        .group-name {
            font-weight: 600;
            margin-bottom: 0.25rem;
        }
        
        .group-desc {
            font-size: 0.85rem;
            color: var(--gray);
            margin-bottom: 0.5rem;
            display: -webkit-box;
            -webkit-line-clamp: 1;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        
        .group-members {
            font-size: 0.8rem;
            color: var(--gray);
            display: flex;
            align-items: center;
        }
        
        .group-members i {
            margin-right: 0.25rem;
            font-size: 0.75rem;
        }
        
        .group-join {
            padding: 0.45rem 1.25rem;
            background-color: white;
            color: var(--primary);
            border: 1px solid var(--primary);
            border-radius: 6px;
            font-weight: 500;
            font-size: 0.9rem;
            transition: all 0.2s;
            white-space: nowrap;
        }
        
        .group-join:hover {
            background-color: var(--primary);
            color: white;
        }
        
        .group-join.joined {
            background-color: var(--primary);
            color: white;
        }
        
        /* 6. 问答精选栏目 */
        .questions-section {
            background-color: white;
            border-radius: 12px;
            padding: 1.5rem;
            box-shadow: var(--shadow);
        }
        
        .questions-list {
            display: flex;
            flex-direction: column;
            gap: 1.5rem;
        }
        
        .question-item {
            padding-bottom: 1.5rem;
            border-bottom: 1px solid var(--border);
        }
        
        .question-item:last-child {
            padding-bottom: 0;
            border-bottom: none;
        }
        
        .question-header {
            display: flex;
            justify-content: space-between;
            margin-bottom: 0.75rem;
        }
        
        .question-category {
            display: inline-block;
            padding: 0.25rem 0.75rem;
            background-color: var(--primary-light);
            color: var(--primary);
            border-radius: 12px;
            font-size: 0.8rem;
            font-weight: 500;
        }
        
        .question-meta {
            font-size: 0.8rem;
            color: var(--gray);
        }
        
        .question-title {
            font-weight: 600;
            font-size: 1.1rem;
            margin-bottom: 0.5rem;
            transition: color 0.2s;
        }
        
        .question-title:hover {
            color: var(--primary);
        }
        
        .question-excerpt {
            font-size: 0.9rem;
            color: var(--gray);
            margin-bottom: 1rem;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        
        .question-stats {
            display: flex;
            gap: 1.5rem;
            font-size: 0.85rem;
            color: var(--gray);
        }
        
        .question-stat {
            display: flex;
            align-items: center;
        }
        
        .question-stat i {
            margin-right: 0.25rem;
        }
        
        .question-answer {
            color: var(--primary);
            font-weight: 500;
            font-size: 0.9rem;
            cursor: pointer;
        }
        
        /* 响应式设计 */
        @media (max-width: 992px) {
            .creators-list {
                grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
            }
            
            .topics-grid {
                grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            }
        }
        
        @media (max-width: 768px) {
            .page-title {
                font-size: 1.75rem;
            }
            
            .section-title {
                font-size: 1.25rem;
            }
            
            .category-cards {
                grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
            }
            
            .creators-list {
                grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
            }
            
            .group-item {
                flex-direction: column;
                align-items: flex-start;
            }
            
            .group-logo {
                margin-bottom: 1rem;
            }
            
            .group-join {
                margin-top: 1rem;
                width: 100%;
            }
        }
        
        @media (max-width: 576px) {
            .main-content {
                padding: 1.5rem 0;
            }
            
            .section-header {
                flex-direction: column;
                align-items: flex-start;
            }
            
            .category-cards,
            .creators-list,
            .topics-grid {
                grid-template-columns: 1fr;
            }
            
            .calendar-grid {
                gap: 0.25rem;
            }
            
            .calendar-date {
                font-size: 0.85rem;
            }
            
            .event-item {
                flex-direction: column;
                align-items: flex-start;
            }
            
            .event-date {
                margin-bottom: 0.75rem;
            }
            
            .event-join {
                margin-top: 0.75rem;
            }
        }
    </style>
</head>
<body>
    <!-- 导航栏 -->
    <nav class="navbar navbar-expand-lg">
        <div class="container">
            <a class="navbar-brand" href="#">社交平台</a>
            
            <div class="collapse navbar-collapse" id="navbarNav">
                <ul class="navbar-nav ms-auto">
                    <li class="nav-item">
                        <a class="nav-link" href="#"><i class="fas fa-home me-1"></i> 首页</a>
                    </li>
                    <li class="nav-item">
                        <a class="nav-link active" aria-current="page" href="#"><i class="fas fa-compass me-1"></i> 发现</a>
                    </li>
                    <li class="nav-item">
                        <a class="nav-link" href="#"><i class="fas fa-users me-1"></i> 社区</a>
                    </li>
                    <li class="nav-item">
                        <a class="nav-link" href="#"><i class="fas fa-bell me-1"></i> 通知</a>
                    </li>
                    <li class="nav-item">
                        <a class="nav-link" href="#"><i class="far fa-user me-1"></i> 我的</a>
                    </li>
                </ul>
            </div>
        </div>
    </nav>
    
    <div class="container main-content">
        <!-- 页面标题 -->
        <div class="page-header">
            <h1 class="page-title">发现感兴趣的内容</h1>
            <p class="page-desc">浏览各种分类栏目，找到您感兴趣的话题、活动和社区，与志同道合的人建立联系。</p>
        </div>
        
        <!-- 1. 分类卡片栏目 - 适合展示主要内容分类 -->
        <div class="section">
            <div class="section-header">
                <h2 class="section-title"><i class="fas fa-th-large"></i> 内容分类</h2>
                <div class="section-actions">
                    <a href="#" class="view-all">查看全部分类 <i class="fas fa-angle-right"></i></a>
                </div>
            </div>
            
            <div class="category-cards">
                <div class="category-card">
                    <img src="https://picsum.photos/600/400?random=1" class="category-img" alt="旅行分类">
                    <div class="category-body">
                        <h3 class="category-title">旅行探索</h3>
                        <p class="category-desc">分享旅行经历、目的地攻略和摄影作品，发现世界各地的美丽风景。</p>
                        <div class="category-meta">
                            <span class="category-count"><i class="fas fa-post"></i> 2.4k 内容</span>
                            <span>热门</span>
                        </div>
                    </div>
                </div>
                
                <div class="category-card">
                    <img src="https://picsum.photos/600/400?random=2" class="category-img" alt="美食分类">
                    <div class="category-body">
                        <h3 class="category-title">美食料理</h3>
                        <p class="category-desc">发现美食食谱、餐厅推荐和烹饪技巧，满足您的味蕾探索欲望。</p>
                        <div class="category-meta">
                            <span class="category-count"><i class="fas fa-post"></i> 3.1k 内容</span>
                            <span>热门</span>
                        </div>
                    </div>
                </div>
                
                <div class="category-card">
                    <img src="https://picsum.photos/600/400?random=3" class="category-img" alt="摄影分类">
                    <div class="category-body">
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